Yamaha TG500 - Manual (Page 250)

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UTILITY MODE / WAVE EDIT MODE
THE WAVE EDIT MODE
THE WAVE EDIT MODE
Unlike the other TG500 edit modes, the WAVE mode is not directly accessed
from a play mode. To access the WAVE mode, press the [EDIT/COMPARE] key
while utility mode “UTL WAVE” screen (“5: Wave”) is showing.
The wave edit mode can only be accessed if one or two SYEMB06 Memory
Expansion Boards are installed in the TG500 expansion memory slot (see page 282
for details on memory expansion).